Frequently Asked Questions About Peterbilt 375/377 Charge Air Coolers

What years and engine models are these charge air coolers compatible with?

Our Peterbilt 375/377 charge air coolers are designed to fit models from 1987 through 2007. They're compatible with most common engine configurations including Caterpillar C12, C13, and C15, Cummins ISX and N14, and Detroit Series 60 engines. However, exact fitment can vary based on your specific truck configuration and whether you have OEM or aftermarket modifications. We recommend checking your current charge air cooler's part number or contacting us with your VIN for verification.

Are these aluminum or plastic tank charge air coolers, and which is better for my truck?

We offer both aluminum tank and plastic tank options. Aluminum tanks are typically more durable and better suited for heavy-duty applications or extreme temperature conditions, though they cost more upfront. Plastic tank coolers are more affordable and work well for standard applications, but may need replacement sooner in harsh environments. Most 375/377 models came with plastic tanks from the factory, but many drivers upgrade to aluminum for longevity.

How difficult is the installation, and what tools will I need?

Installation typically takes 2-4 hours for someone with moderate mechanical experience. You'll need basic hand tools including socket sets, screwdrivers, and pliers. The most challenging part is usually accessing and removing the old cooler, which requires removing the grille and potentially loosening radiator mounts. New coolers should drop in place using existing mounting points, but you may need to transfer fittings from your old unit. Always replace rubber hoses and clamps during installation.

What's the difference between OEM and aftermarket charge air coolers for my 375/377?

OEM charge air coolers are built to exact factory specifications but typically cost 40-60% more than quality aftermarket options. Our aftermarket coolers meet or exceed OEM cooling capacity and use upgraded materials in many cases. The main differences are price and sometimes improved features like thicker cores or reinforced tanks. Aftermarket units maintain the same mounting dimensions and connections, so fitment isn't compromised.

How do I know when my charge air cooler needs replacement?

Common signs include loss of boost pressure, increased exhaust temperatures, visible oil residue around cooler connections, or physical damage like bent fins or cracked tanks. A pressure test can confirm internal leaks - coolers should hold 30 PSI for at least 15 seconds without dropping. If you're experiencing reduced fuel economy, black smoke, or sluggish acceleration, these often indicate charge air cooler problems. Minor fin damage can sometimes be straightened, but tank cracks or core leaks require replacement.